Ocean surface energy balance allows a constraint on the sensitivity of precipitation to global warming

• Published in: Nature Communications
• Main Authors: Wang, Wei, Chakraborty, T. C., Xiao, Wei, Lee, Xuhui
• Format: Article in Journal/Newspaper
• Language: English
• Published: Springer Science and Business Media LLC 2021
• Subjects: General Physics and Astronomy; General Biochemistry, Genetics and Molecular Biology; General Chemistry; Sea ice
• Online Access: http://dx.doi.org/10.1038/s41467-021-22406-7; http://www.nature.com/articles/s41467-021-22406-7.pdf; http://www.nature.com/articles/s41467-021-22406-7

Abstract Climate models generally predict higher precipitation in a future warmer climate. Whether the precipitation intensification occurred in response to historical warming continues to be a subject of debate. Here, using observations of the ocean surface energy balance as a hydrological constraint, we find that historical warming intensified precipitation at a rate of 0.68 ± 0.51% K −1 , which is slightly higher than the multi-model mean calculation for the historical climate (0.38 ± 1.18% K −1 ). The reduction in ocean surface albedo associated with melting of sea ice is a positive contributor to the precipitation temperature sensitivity. On the other hand, the observed increase in ocean heat storage weakens the historical precipitation. In this surface energy balance framework, the incident shortwave radiation at the ocean surface and the ocean heat storage exert a dominant control on the precipitation temperature sensitivity, explaining 91% of the inter-model spread and the spread across climate scenarios in the Intergovernmental Panel on Climate Change Fifth Assessment Report.